LoadError - 預計會定義。調用模塊時Rails錯誤

Question

我有一個名爲EntityTrackerHelper的模塊。以下是代碼：

module EntityTrackerHelper 
    def self.createUserAction(user_id, type, entity_id) 
     existingua = UserAction.find(:first, :conditions=> ["user_id = ? and type = ? and entity_id=?", user_id, type, entity_id]) 
     if existingua.nil? 
      ua = UserAction.new 
      ua.user_id = user_id 
      ua.type = type 
      ua.entity_id = entity_id 
      ua.date = Time.now 
      ua.save 
     else 
      existingua.date = Time.now 
      existingua.save 
     end 
    end 
end 

它用於跟蹤實體中的更改和用戶訪問。 它在控制器中使用如下。

require "#{Rails.root}/lib/EntityTrackerHelper" 
class LessonSectionsController < InheritedResources::Base 
    def index 
     user_id = params[:user_id] 
     lesson_id = params[:lesson_id] 
     EntityTrackerHelper::createUserAction(user_id, 'LESSON', lesson_id) 
     lessonSections = LessonSection.find(:all, :conditions => { :lesson_id => params[:lesson_id] }) 
     render :json => {:sections => lessonSections.as_json({:only => [:lesson_id,:id,:name]}), :error => ''} 
    end 
end 

我得到以下錯誤：

LoadError (Expected /<ProjPath>/<ProjName>/app/models/lesson.rb to define LESSON): 
    lib/EntityTrackerHelper.rb:12:in `createUserAction' 
    app/controllers/lesson_sections_controller.rb:9:in `index' 

線12 EntityTrackerHelper是UserAction.find...

任何想法？

感謝

Answer 1

的ActiveRecord將使用領域type爲 「單表繼承」。請參閱http://api.rubyonrails.org/classes/ActiveRecord/Base.html（副標題：單表繼承）。

這意味着當它加載類型爲LESSON的UserAction時，ActiveRecord會嘗試實例化沒有定義的類LESSON。

您可能應該爲您的type列使用另一個名稱。

Answer 2

您可以嘗試使用

**include EntityTrackerHelper** 

更多信息檢查此鏈接Call Module function from Controller (NoMethodError)